Amc 258 I6 Engine - Photo 04

The truth of the matter is that the AMC 258 I-6 is a great engine, but the computer-controlled Carter carburetor that fueled these engines in the YJ was prone to failure. As a fix, we love Howell Engine Developments TBI injection kits, but you also can adapt a Motorcraft 2100 to a 258 with great results on- and off-road.